US3567397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for obtaining a dross-free crystalline growth melt
Assignee: Westinghouse Electric Corp
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Filing: 1967-10-11
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Granted: 1971-03-02
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Expires: 1987-10-11
Abstract
Abstract THIS INVENTION PROVIDES APPARATUS FOR GROWING WEBBED DENDRITIC SEMICONDUCTOR MATERIAL FROM A MELT SUBSTANTIALLY FREE OF ANY DROSS ON THE SURFACE OF THE MELT. THE APPARATUS COMPRISES A TWO COMPONENT CRUCIBLE, CONSISTING OF AN INNER SHELL AND AN OUTER SHELL. THE MELT IS FORMED IN THE OUTER SHELL. THE INNER SHELL, AXIALLY ALIGNED WITH THE OUTER SHELL, HAS A VERTICAL DISPLACEMENT MEANS ATTACHED TO IT. THE INNER SHELL IS LOWERED INTO THE MELT OF THE OUTER SHELL AND DROSS FREE MELT IS FORCED THROUGH AN APERTURE IN THE APEX OF A CAVITY OF THE INNER SHELL FORMING A POOL OF DROSS FREE MELT THEREIN. FROM THIS DROSS FREE MELT THE WEBBED DENDRITIC SEMICONDUCTOR MATERIAL IS GROWN.
Inventors
- 👤 Sydney O'hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:46
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/10; C30B15/12; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10T; Y10T117/00; Y10T117/10; Y10T117/1004; Y10T117/1024; Y10T117/1032; Y10T117/1052
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |